title: Recombinant AAV serotype and capsid mutant comparison for pulmonary gene transfer of alpha-1-antitrypsin using invasive and noninvasive delivery.
abstract: Recombinant adeno-associated viral (rAAV) vectors have been widely used in pulmonary gene therapy research. In this study, we evaluated the transduction and expression efficiencies of several AAV serotypes and AAV2 capsid mutants with specific pulmonary targeting ligands in the mouse lung. The noninvasive intranasal delivery was compared with the traditional intratracheal lung delivery. The rAAV8 was the most efficient serotype at expressing alpha-1-antitrypsin (AAT) in the lung among all the tested serotypes and mutants. A dose of 1 x 10(10) vg of rAAV8-CB-AAT transduced a high percentage of cells in the lung when delivered intratrachealy. The serum and the broncho-alveolar lavage fluid (BALF) levels of human AAT (hAAT) were about 6- and 2.5-fold higher, respectively, than those of rAAV5 group. Among the rAAV2 capsid mutants, the rAAV2 capsid mutants that display a peptide sequence from hAAT ("long serpin") indicated a twofold increase in transgene expression. For most vectors, the serum hAAT levels achieved after intranasal delivery were 1/2 to 1/3 of those with the intratracheal method. Overall, rAAV8 was the most promising vector for the future application in gene therapy of pulmonary diseases such as AAT deficiency-related emphysema.
authors.affiliation: Department of Pediatrics and Powell Gene Therapy Center, University of Florida, Gainesville, Florida, USA.
authors.forename: Rejean
authors.initials: R
authors.lastname: Liqun Wang
authors.forename: Thomas
authors.initials: T
authors.lastname: McLaughlin
authors.forename: Travis
authors.initials: T
authors.lastname: Cossette
authors.forename: Qiushi
authors.initials: Q
authors.lastname: Tang
authors.forename: Kevin
authors.initials: K
authors.lastname: Foust
authors.forename: Martha
authors.initials: M
authors.lastname: Campbell-Thompson
authors.forename: Ashley
authors.initials: A
authors.lastname: Martino
authors.forename: Pedro
authors.initials: P
authors.lastname: Cruz
authors.forename: Scott
authors.initials: S
authors.lastname: Loiler
authors.forename: Christian
authors.initials: C
authors.lastname: Mueller
authors.forename: Terence R
authors.initials: TR
authors.lastname: Flotte
mesh_terms: D000818:Animals; D002213:Capsid / Q000378:metabolism; D000229:Dependovirus / Q000235:genetics*; D004797:Enzyme-Linked Immunosorbent Assay; D018014:Gene Transfer Techniques; D005822:Genetic Vectors / Q000235:genetics*; D008168:Lung; D051379:Mice; D008810:Mice, Inbred C57BL; D016133:Polymerase Chain Reaction; D000515:alpha 1-Antitrypsin / Q000097:blood / Q000235:genetics*
chemical_list: D000515:alpha 1-Antitrypsin